http://picvietnam.com/forum/showthread.php?t=519
I'm so sorry that I didn't tell you about the free ftp of picvietnam, because I've noted it in my signature, but it's Vietnamese
Anyway, the info is now as above. Create your own folder Dongdong, your url will be:
picvietnam.com/download/upload/Dongdong/ebook.pdf (for example)
Goodluck.